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network throughput


I would like to find out the max achievable network throughput on a
devboard_lx (For example, in experiments with netperf, I found that tcp
throughput was atmost 15 Mbps, and sending UDP packets back to back
caused receiver overruns pretty fast...)

I was trying to find the specifications for the devboard_lx to use for
calculations of 
max. achievable data throughput; it would be useful to know:
- data bus width (32 bit??)
- data bus speed 
- dma setup latency
- size of network rx buffers (32KB??)
- maybe typical interrupt latency....

does anyone have these numbers or know how/where to obtain them?